It is not a very well known and understood that an incandescent lamp also has high initial current though for one or 1.5 waveform cycles (around 24ms at 60Hz). Below is an experiment with 60W lamp. Note that the peak inrush current is around 4 times the normal inrush current. This is due to the fact that a cold (initially OFF and at ambient temperature) lamp has lower resistance compared to a warm (or rather hot) lamp. Until the time the lamp reaches its steady state temperature, the current will be hight.

Compared to a LED lamp inrush or a CFL lamp inrush, this differs in the fact that the inrush is spread over 1 to 1.5 waveform cycles whereas the LEED and CFL inrush is very sharp with very sharp rising and falling edges.

Incandescent lamp inrush current-60W. Red-Voltage, Blue-Current, Brown-RMS Current

Measured lamp resistance

Cold- 46.4 Ω

Warm-81 Ω